WO2015145611A1 - Dispositif de conversion acoustique pour une régulation active du bruit - Google Patents

Dispositif de conversion acoustique pour une régulation active du bruit Download PDF

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Publication number
WO2015145611A1
WO2015145611A1 PCT/JP2014/058501 JP2014058501W WO2015145611A1 WO 2015145611 A1 WO2015145611 A1 WO 2015145611A1 JP 2014058501 W JP2014058501 W JP 2014058501W WO 2015145611 A1 WO2015145611 A1 WO 2015145611A1
Authority
WO
WIPO (PCT)
Prior art keywords
closed space
active noise
noise control
speaker unit
volume
Prior art date
Application number
PCT/JP2014/058501
Other languages
English (en)
Japanese (ja)
Inventor
準一 飯田
Original Assignee
パイオニア株式会社
東北パイオニア株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パイオニア株式会社, 東北パイオニア株式会社 filed Critical パイオニア株式会社
Priority to PCT/JP2014/058501 priority Critical patent/WO2015145611A1/fr
Priority to JP2016509704A priority patent/JP6267323B2/ja
Priority to US15/128,547 priority patent/US9947310B2/en
Publication of WO2015145611A1 publication Critical patent/WO2015145611A1/fr
Priority to US15/920,736 priority patent/US10249285B2/en

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/025—Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/128—Vehicles
    • G10K2210/1282—Automobiles
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3212—Actuator details, e.g. composition or microstructure
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3214—Architectures, e.g. special constructional features or arrangements of features
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3229—Transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/028—Casings; Cabinets ; Supports therefor; Mountings therein associated with devices performing functions other than acoustics, e.g. electric candles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of loudspeakers
    • H04R5/023—Spatial or constructional arrangements of loudspeakers in a chair, pillow

Definitions

  • the present invention relates to an acoustic converter for active noise control provided with a speaker unit that emits sound into the interior space of a vehicle.
  • Patent Document 1 a noise canceling device (acoustic conversion device for active noise control) that suppresses or eliminates noise around a vehicle has been proposed (for example, see Patent Document 1).
  • the noise canceling device described in Patent Document 1 the relationship between noise such as engine sound, wind noise, tire friction sound, and vehicle state such as vehicle type, speed, acceleration, etc. is stored in advance. The noise is suppressed or eliminated by radiating a sound having a phase opposite to that of the noise into the vehicle interior space according to the state.
  • An example of an object of the present invention is to provide an active noise control acoustic converter that can effectively suppress or remove noise by suppressing fluctuations in the minimum resonance frequency.
  • an active noise control acoustic converter includes a speaker unit that emits sound into an interior space of a vehicle, and the speaker unit.
  • a diaphragm and an edge that supports the diaphragm; and a volume of the closed space is smaller than an equivalent compliance air volume of the speaker unit.
  • FIG. 1 It is the schematic which shows the acoustic converter for active noise control which concerns on Example 1 of embodiment of this invention. It is a perspective view which shows a mode that the said acoustic converter for active noise control was provided in the vehicle. It is a side view which shows a mode that the said acoustic converter for active noise control was provided in the said vehicle. It is a graph which shows the frequency characteristic of the sound which the said acoustic converter for active noise control radiates
  • An acoustic conversion device for active noise control includes a speaker unit that emits sound into an interior space of a vehicle, and a closed space forming unit that is attached with the speaker unit to form a closed space.
  • the speaker unit includes: a diaphragm whose one surface radiates sound into the indoor space and the other surface radiates sound into the closed space; and an edge that supports the diaphragm.
  • the volume of the closed space is smaller than the equivalent compliance air volume of the speaker unit.
  • the vibration plate and its peripheral members move. It is suppressed, and the deterioration with time of the speaker unit can be suppressed. Therefore, fluctuations in the lowest resonance frequency can be suppressed, and the phase of the radiated sound is hardly shifted from the opposite phase of the noise, and the noise can be effectively suppressed or removed.
  • the volume of the closed space is preferably 40% or more and 80% or less of the equivalent compliance air volume. If the volume of the closed space is larger than 80% of the equivalent compliance air volume, the effect of suppressing the deterioration of the speaker unit over time is reduced. Further, if the volume of the closed space is smaller than 40% of the equivalent compliance air volume, the movement of the diaphragm and the edge is excessively suppressed, and the sound pressure particularly in the low range is reduced. Therefore, by setting the volume of the closed space to 40% or more and 80% or less of the equivalent compliance air volume, it is possible to more effectively suppress the deterioration with time of the diaphragm and the peripheral members as described above, and at low sound. Sound pressure can be secured.
  • the lowest resonance frequency in a state where the speaker unit and the closed space forming means are assembled is 30 Hz or more and 50 Hz or less. Accordingly, for example, noise (for example, 40 Hz to 200 Hz) included in the engine sound can be effectively suppressed or removed.
  • noise for example, 40 Hz to 200 Hz
  • the lowest resonance frequency is higher than 50 kHz, it is difficult to suppress the sound wave having the opposite phase with respect to the low noise (for example, around 40 Hz), and the lowest resonance frequency is higher than 30 Hz. If it is too small, the compliance (easiness of movement of the diaphragm) of the speaker unit will increase, and the peripheral members of the diaphragm will easily deteriorate.
  • the effective vibration aperture of the diaphragm is 10 cm or more and 14 cm or less, and the volume of the closed space is 5 liters or more and 7 liters or less.
  • the overall size of the acoustic converter for active noise control can be reduced, and it can be easily installed in the vicinity of the passenger using an appropriate space of the vehicle.
  • the effective vibration aperture is too large or the volume of the closed space is too large, it becomes difficult to install this acoustic converter for active noise control near the passenger.
  • the effective vibration aperture is too small or the volume of the closed space is too small, the sound pressure at the low sound of the active noise control acoustic converter becomes small.
  • the effective vibration diameter means the diameter of the portion of the speaker unit that vibrates when sound is radiated. Typically, a half of the difference between the inner and outer diameters of the edge is used as the radius of the diaphragm. It is added.
  • the closed space forming means is preferably provided below the seat of the vehicle. Thereby, the interior space of the vehicle can be used effectively.
  • the closed space forming means is preferably provided on the dashboard of the vehicle. Thereby, the interior space of the vehicle can be used effectively.
  • the closed space forming means is preferably provided under the floor of the vehicle. Thereby, the space under the floor of the vehicle can be used effectively.
  • the closed space forming means includes: a first member that forms a first closed space that houses the speaker unit; and a second member that forms a second closed space communicating with the first closed space; It is preferable that the sound radiated from the unit to the first closed space is radiated to the second closed space.
  • the closed space forming means includes a first member that forms a first closed space that houses the speaker unit, and a second member that forms a second closed space that communicates with the first closed space. It is preferable that the volume of the space is the sum of the volume of the first closed space and the volume of the second closed space.
  • FIG. 1 is a schematic diagram illustrating an active noise control acoustic transducer 1 according to a first embodiment of the present invention.
  • FIGS. 2 and 3 illustrate a state where the active noise control acoustic transducer 1 is provided in a vehicle C, respectively.
  • FIG. 4 is a graph showing frequency characteristics of generated sound of the active noise control acoustic converter 1.
  • the acoustic conversion device 1 for active noise control includes a speaker unit 2 that emits sound and an enclosure 3 to which the speaker unit 2 is attached, that is, a closed space forming unit that houses the speaker unit 2.
  • the speaker unit 2 is controlled by the provided control means.
  • the speaker unit 2 includes a diaphragm (not shown), an edge (not shown) that supports the diaphragm, a magnetic circuit (not shown) that can drive the diaphragm, a frame (not shown) that supports the edge and the magnetic circuit, and a natural vibration of the diaphragm. And a damper (not shown) that suppresses noise, and the surface of the diaphragm is configured to radiate sound into the interior space A1 of the vehicle C.
  • the rear surface of the diaphragm may be configured to emit sound into the indoor space A1.
  • the effective vibration aperture of the diaphragm is set to 12 cm, for example.
  • the equivalent compliance air volume V as means the volume of the closed space on the rear side of the diaphragm when the elastic value of the diaphragm of the speaker unit is equal to the elastic value of the air behind the diaphragm. That is, if a closed space smaller than the equivalent compliance air volume V as is formed on the rear side of the diaphragm, the diaphragm is less likely to vibrate (suspension is hard) and the bass is reduced, and is larger than the equivalent compliance air volume V as. When the closed space is formed, the diaphragm easily vibrates (the suspension is soft), and the bass is increased.
  • the enclosure 3 forms a sealed closed space A2 on the back side of the diaphragm of the speaker unit 2, and the closed space A2 is formed such that the volume V A2 is smaller than the equivalent compliance air volume V as .
  • the volume V A2 of the closed space A2 is, for example, 55% of the equivalent compliance air volume V as and 6 liters.
  • the acoustic converter 1 for active noise control as described above has a minimum resonance frequency F 0 (substantially equal to the minimum resonance frequency F S of the diaphragm) of, for example, 40 Hz, and this acoustic converter 1 for active noise control radiates.
  • the sound pressure of sound has a frequency characteristic as shown by a solid line in FIG.
  • a sound radiated when the acoustic conversion device 1 for active noise control is not controlled by the control means is a generated sound, and the phase of the generated sound has a frequency characteristic as shown by a broken line in FIG.
  • the storage means provided in the vehicle C stores the frequency dependence of the phase of the generated sound in advance, and the control means controls the phase based on this, so that the active noise control acoustic conversion device 1 A canceling sound having an opposite phase is radiated to the indoor space A1.
  • the phase of the generated sound has a large slope in the vicinity of the lowest resonance frequency F 0 as shown in FIG.
  • the acoustic converter 1 for active noise control can control the phase of sound mainly at a frequency higher than the lowest resonance frequency F 0 (that is, a frequency at which the phase gradient is not large). If the minimum resonance frequency F 0 varies, the phase variation with respect to a small change in the frequency increases, making it difficult to control the phase appropriately. Therefore, in the acoustic conversion device 1 for active noise control, it is necessary to keep the minimum resonance frequency F 0 of the output sound constant even if the speaker device is deteriorated with time.
  • phase control by the control means will be specifically described.
  • the control means controls the phase to advance by 45 ° in advance.
  • a canceling sound is emitted.
  • the minimum resonance frequency F 0 changes to a smaller value and the phase delay fluctuates greatly from 45 ° at 45 Hz, it becomes difficult for the control means to properly control the phase.
  • the canceling sound may deviate from the opposite phase of the noise, and the user may hear a sound stronger than the original noise, rather than suppressing the noise.
  • the volume V A2 of the closed space A2 is smaller than the equivalent compliance air volume V as , and the movement of the diaphragm, edge, and damper is provided by providing the enclosure 3. Is suppressed, and deterioration of the edge and the damper over time can be suppressed. Therefore, fluctuations in the minimum resonance frequency F 0 can be suppressed.
  • the control means controls the phase based on the frequency dependence of the phase of the generated sound stored in advance, the phase of the canceling sound is hardly shifted from the opposite phase of the noise, and the noise is effectively suppressed or Can be removed.
  • volume V A2 of the closed space A2 of the closed space A2 is 55% of the equivalent compliance air volume V as , deterioration of the diaphragm, the edge, and the damper can be suppressed, and the bass is not reduced too much. Can be.
  • the lowest resonance frequency F 0 is 40 Hz, it is possible to effectively suppress or remove the low-frequency noise included in the engine sound.
  • the effective vibration aperture of the diaphragm is 12 cm and the volume V A2 of the closed space A2 is 6 liters, the overall size of the acoustic conversion device 1 for active noise control is reduced, and an appropriate space of the vehicle C is provided. It can be installed near the passenger.
  • the installation position and shape of the acoustic conversion device 1 for active noise control in a vehicle will be described.
  • the active noise control acoustic converter 1 is provided below the seats S and on the dashboard D, and is formed in a rectangular parallelepiped shape so that it can be installed at these positions.
  • the active noise control acoustic converter 1 can be installed by effectively using the indoor space A1 of the vehicle C.
  • the enclosure 3B includes a first member 31 that forms a first closed space A3 that houses the speaker unit 2, and a first closed space. And a second member 32 forming a second closed space A4 communicating with A3.
  • the speaker unit 2 radiates sound to the first closed space A3 behind, and this sound is further radiated to the second closed space A4. Accordingly, the first closed space A3 and the second closed space A4 constitute a closed space A2.
  • the volume V A2 of the closed space A2 is formed to be smaller than the equivalent compliance air volume V as substantially as in the first embodiment.
  • the first member 31 is provided in the vicinity of the passenger, and the second member 32 is provided in the vehicle C where it is easy to secure an installation space.
  • the first member 31 may be provided at the foot of the passenger and the second member 32 may be provided below the seat S.
  • the first member 31 is provided. May be provided on the dashboard D, and the second member 32 may be provided on the floor away from the passenger.
  • volume VA2 can be secured.
  • the active noise control acoustic conversion device 1 is formed in a rectangular parallelepiped shape that can be installed under the seat S or on the dashboard D, but has an appropriate shape depending on the installation location.
  • the active noise control acoustic converter 1C may include an enclosure 3C extending in a predetermined longitudinal direction. Good.
  • the active noise control acoustic converters 1 and 1B are provided below the seat S or on the dashboard D.
  • the control acoustic conversion device 1D may be provided below the floor of the vehicle C, and the speaker unit 2 may emit sound at the feet of the passenger. According to such a configuration, the space under the floor can be used effectively, and noise can be effectively suppressed or eliminated by emitting sound in the vicinity of the passenger.
  • the engine sound is exemplified as the noise.
  • the noise may be configured to suppress or remove noise such as wind noise and tire friction noise.
  • noise patterns corresponding to vehicle conditions such as vehicle type, speed, and acceleration may be stored in advance. May be emitted.
  • volume of the closed space, the minimum resonance frequency, and the effective vibration aperture may be set to appropriate values as long as the volume of the closed space is smaller than the equivalent compliance air volume.
  • the speaker unit only needs to include a diaphragm and an edge, and other shapes and methods are not particularly limited as long as they can generate sound with appropriate sound pressure at a frequency according to noise. Good.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

L'invention concerne un dispositif de conversion acoustique pour une régulation active du bruit. Le dispositif permet de supprimer ou d'éliminer du bruit efficacement en supprimant les variations de la fréquence de résonance la plus basse. Comme le volume (VA2) d'un espace fermé (A2) est défini comme étant inférieur au volume d'air équivalent de conformité (Vas) d'une unité de haut-parleur (2), les mouvements d'une membrane, d'une partie de bord et d'un amortisseur sont supprimés. La détérioration de la partie de bord et de l'amortisseur dans le temps peut ainsi être supprimée, les variations de la fréquence de résonance la plus basse sont supprimées, et le son émis ne peut quasiment pas être décalé en phase par rapport à la phase opposée du bruit, ce qui permet au bruit d'être efficacement supprimé ou éliminé.
PCT/JP2014/058501 2014-03-26 2014-03-26 Dispositif de conversion acoustique pour une régulation active du bruit WO2015145611A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PCT/JP2014/058501 WO2015145611A1 (fr) 2014-03-26 2014-03-26 Dispositif de conversion acoustique pour une régulation active du bruit
JP2016509704A JP6267323B2 (ja) 2014-03-26 2014-03-26 アクティブノイズコントロール用音響変換装置
US15/128,547 US9947310B2 (en) 2014-03-26 2014-03-26 Acoustic conversion device for active noise control
US15/920,736 US10249285B2 (en) 2014-03-26 2018-03-14 Acoustic conversion device for active noise control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2014/058501 WO2015145611A1 (fr) 2014-03-26 2014-03-26 Dispositif de conversion acoustique pour une régulation active du bruit

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US15/128,547 A-371-Of-International US9947310B2 (en) 2014-03-26 2014-03-26 Acoustic conversion device for active noise control
US15/920,736 Division US10249285B2 (en) 2014-03-26 2018-03-14 Acoustic conversion device for active noise control

Publications (1)

Publication Number Publication Date
WO2015145611A1 true WO2015145611A1 (fr) 2015-10-01

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PCT/JP2014/058501 WO2015145611A1 (fr) 2014-03-26 2014-03-26 Dispositif de conversion acoustique pour une régulation active du bruit

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JP (1) JP6267323B2 (fr)
WO (1) WO2015145611A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10239475B2 (en) * 2017-01-20 2019-03-26 Ford Global Technologies, Llc Wind noise throb reduction system and method
DE102017217646B3 (de) 2017-10-05 2018-10-25 Bayerische Motoren Werke Aktiengesellschaft Anordnung eines Lautsprechers an einem Personenkraftwagen
WO2019222208A1 (fr) 2018-05-18 2019-11-21 Oshkosh Corporation Insonorisation dans un siège
DE102018215996A1 (de) * 2018-09-20 2020-03-26 Bayerische Motoren Werke Aktiengesellschaft Fahrzeug mit einem Lautsprecher

Citations (4)

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JPH04281125A (ja) * 1991-02-07 1992-10-06 Mitsubishi Electric Corp 消音装置及び消音方法
JPH09247777A (ja) * 1996-03-06 1997-09-19 Kenwood Corp スピーカユニット
JP2002271882A (ja) * 2001-03-13 2002-09-20 Sanyo Electric Co Ltd スピーカ装置
JP2003037894A (ja) * 2001-07-23 2003-02-07 Matsushita Electric Ind Co Ltd スピーカおよびこのスピーカを用いたスピーカ装置

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Publication number Priority date Publication date Assignee Title
US3882962A (en) * 1973-10-03 1975-05-13 Warren Ripple Loudspeaker equipment
JPH03129998A (ja) * 1989-10-14 1991-06-03 Sony Corp スピーカ装置
JP2000050384A (ja) * 1998-08-03 2000-02-18 Sony Corp スピーカ装置
JP2001119788A (ja) * 1999-10-14 2001-04-27 Sony Corp スピーカ装置
JP2002351488A (ja) 2001-05-28 2002-12-06 Matsushita Electric Ind Co Ltd ノイズキャンセル装置および車載システム
JP3981926B2 (ja) * 2003-11-17 2007-09-26 ソニー株式会社 スピーカ装置
US20070076912A1 (en) * 2005-09-30 2007-04-05 Griffiths Richard D Audio speaker enclosures
US20080101645A1 (en) * 2006-10-20 2008-05-01 Rosen Michael D Low frequency electroacoustical transducing in a vehicle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04281125A (ja) * 1991-02-07 1992-10-06 Mitsubishi Electric Corp 消音装置及び消音方法
JPH09247777A (ja) * 1996-03-06 1997-09-19 Kenwood Corp スピーカユニット
JP2002271882A (ja) * 2001-03-13 2002-09-20 Sanyo Electric Co Ltd スピーカ装置
JP2003037894A (ja) * 2001-07-23 2003-02-07 Matsushita Electric Ind Co Ltd スピーカおよびこのスピーカを用いたスピーカ装置

Also Published As

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US20170110107A1 (en) 2017-04-20
JPWO2015145611A1 (ja) 2017-04-13
US10249285B2 (en) 2019-04-02
US9947310B2 (en) 2018-04-17
JP6267323B2 (ja) 2018-01-24
US20180204559A1 (en) 2018-07-19

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